You are able to craft an infusion that helps you move underwater

Prerequisite: Profession: Herbalist 10 ranks, Craft Infusion, one other Infusion feat, Advanced Infusion ability

Benefit: You can create a water infusion by gathering materials from a shallow area of water such as in a lagoon, pool or along the beach. The infusions must be burned and the ill-scented smoke inhaled by the target for ten minutes.

The user of the Infusion of Water can gains the effect of Waterbreathing for the duration of the infusion.